I was taught “Edible (fit to be eaten as food) vs Eatable (capable of being chewed up and swallowed)” but modern usage seems to treat them as synonyms (the former just being more pleasant to eat than the latter).
No more pedantic than the comment I was replying to. My advice would be not to use "eatable" at all because others will just think you're saying edible incorrectly.
Is it edible? Yeah, it is eatable.
Here I am, years later, learning I was right all along.